This amulet protects you from spells and effects that would significantly change your bodily form or composition. Whenever you are the target of such an effect, you can expend 1 charge to negate the transformation. You must decide whether to use the charge before you attempt a saving throw. Effects that the amulet protects against include, but are not limited to, polymorph, petrification, the touch of an aboleth's tentacle, and the attack of a chaos beast.

An amulet of inviolate form has 7 charges when created, one for each garnet. Each time a charge is expended, one garnet turns a dull black color.